Sewing-machine mechanism.



No. 643,478. Patented Feb. I3, |900.

M. DENDUHENT.

SEWINGLMACHINE MECHANISM.

(Application led Mar. 6', 1897.)

(No Model.) 2 Sheets-Sheet |l No. 643,478. Patented Feb. I3, |900.

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(Application led Mar. 6, 1891.) (No Model.) 2.Shaet8-Sheet 2,

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UNITED STATES 'PATENT FFIC.

MURNEY DENDURENT, OF PADONIA, KANSAS;

SEWINGAMACHINE MECHANISM.

'srscrricnrriv forming peut of Letters Patent No. 643,478, dated February' 1a, 1906.

Application led March 6, 1897. Serial No. 626j226. (No model.)

To all whom, it may cow/cern.-

Be it known that I, MRNEY DENDURENT, a citizen of the United States, residing at Padonia, in the county of Brown and State of Kansas, have invented certain new and useful Improvements in Sewing-Machine Mechanisms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to sewing-machines, and has for its object to simplify and improve the feed and shuttle actuating mechanisms, to the end that the same shall comprise fewer parts, be easy-running and capable of ready access, and require less time to assemble and adjust. The improved construction also reduces the cost of manufacture, renders the machine less liable to get out of order, and involves no complicated parts to gather lint and dirt.

The invention consists in certain novel features and details of construction and arrangement of parts, as hereinafter particularly set forth, illustrated in the drawings, and incorporated in the claims.

In the accompanying drawings, Figure lis a longitudinal section through a sufcient portion of a sewing-machine head to illustrate the application of the present improvements thereto. Fig. 2 is a vertical cross section taken through the upright portion of the frame. Fig. 3 is a bottom plan view of the sewingmachine bed. Fig. 4 is an enlarged detail view showing the operating mechanism on the crank-shaft and its relation to the feed-lever. Fig. 5 is adetail view of the screw connecting the arms of the fork on the shuttlc-lever.

Similar numerals of reference designate corresponding parts in the several figures of the drawings.

In the drawings, 1 designates the arm of the sewing-machine, comprising the overhan'ging horizontal portion 2 and the upright or` vertical portion 3, the said arm being mounted upon the bed-plate et in the usual manner and being hollowed to receive the feed and shuttle levers and contiguous parts of the inechanismi 5 designates a crank -shaft which passes through the upper portion of the head, being journaled at the opposite ends thereof on ball-bearings 6, the wear of which may be taken up by ball-cones 7, having a threaded connection with said crank-shaft land held by means ofjam-nuts 8. The crank of said shaft is formed by extending an intermediate portion 9 of said shaft obliquely and connecting 6o the same to a rightangular offset IO, arranged in the upper portion of the upright part of the head, as clearly shown in Fig. l.

1l designates the shuttle-lever, which is L- shaped and fulcrumed on a vertical pin or screw 12 under the bed-'plate 4. This lever is also provided with a horizontal extension 13, which projects into the upper portion of the frame, where it is pivotally mounted by means of a pin or screw 14, arranged above 7o and in vertical alinement with the pivot 12. This affords a wide bearing for the shuttlelever and serves to steady the same in its swinging movements. The shuttle-lever is provided at its upper end with a fork 15, the

arms of which straddle the crank 9, said arms being connected above the crank by means of a screw I6, one end of which is provided with a greater number of threads to the inch than the other end, so that by turning said screw 8o in the arms of the fork said arms will be moved toward or away from each other, according to the direction in which the screw is turned, thus giving the proper engagement between said arms and the crank-shaft for taking up 8 5 17 designates the feed-lever, which, like the shuttle-lever, is L-shaped, the same being mounted on a ball-and-socket joint 18, so that it may rock in any direction. This ball-andsocket joint is located beneath the bed-plate 4 at an approximately central point for the purpose'of engaging the feed-lever with the ball member of the joint, said feed-lever being incised or split, as indicated at 19, thus enabling the split portions of the lever to be roc spread apart while passing the same over the ball, after which the split portions are conneeted and securely held together and upon the ball by means of a clamping-screw 20. The split extends horizontally of the lever and terminates at its inner end in an enlargement or slot 2l, which reduces the thickness of the lever at that point sufficiently to provide the necessary resiliency for allowing the split portions of the lever to be sprung apart for the purpose stated. The upright portion 22 of the feed-lever which extends upward within the arm 1 is forked at this upper end to provide an upward extension 23 and a horizontal extension 24, having at its extremitya depending lip 25, the purpose of which will hereinafter appear. Mounted upon the crank-shaft is a double cam 26. One portion 27 of this cam operates against the upward extension 23 for rocking the feed-lever transversely in the portion 3 of the arm 1, while another portion 2S of said cam operates against the horizontal portion 2lC of the feedlever for depressing said lever. The portion 2S of the cam has a beveled surface which cooperates with a corresponding beveled surface 29 on the horizontal extension 2l. This arrangement serves to rock the vertical portion 22 of the feed-lever longitudinally of the arm or in a direction at right angles to the movement imparted to the lever by the portion 27 of the cam. The return movements of said lever are eifected by means of the feedbar 307 which is actuated by means of asuitable spring, said spring acting on the feedbar to depress the feed and return the same to its normal position during the inoperative portion of its stroke. The wire coil-spring 4l is attached to a screw t0 and its free and entersa slot in the feed-bar. The extremity of the lower arm of the feed-lever is shaped to engage a notch 43l in the lower edge of the feed-bar 30 for moving the latter, and the spring, through the medium of the feed-bar, exerts its tension upon the feed-lever to both elevate the latter and rock the same, so as to maintain the portions 23 and 24 of the fork at the upper end of said lever in constant engagement with their respective portions of the cam 2G. Within the portion 3 of the arm is arranged a spring 32, secured at one end fixedly to the arm, the free end of said spring being arranged to bear against the depending lip 25 of the extension 24:. The position of the free end of the spring 32 is regulated by means of a screw 33, which passes through the front side of the arm andv has a threaded connection therewith. This screw forms the feed-regulator, as by adjusting this screw, and consequently the spring 32, the forward movement of the portion 22 of the feed-leveriscorrespondinglylimited. Within the portion 3 of the arm is an obliquelydisposed semicircular or half-round lug 34, against' which the portion 22 of the feed-lever bears and upon which it slides and fulcrums. Secured permanently to the rear side of the feed-lever is a strip 35 of felt or other soft sound-deadening material, the said strip being extended obliquely and substantially at right angles to the lug 3l. In the oscillations of the feed-lever the latter bears and slides upon the lug 34, thus enabling the feedbar-actuating spring to influence the feedlever in such a manner as to cause the forked portions 23 and 24 thereof to move toward the crank-shaft 5 during the backward movements of the portions 27 and 28 of the cam 26.

From the foregoing description it will be seen that the shuttle-lever has a wide pivotal connection and bearing upon the sewing-machine arm and beneath the bed-plate thereof and that provision is made for taking up wear between the crank-shaft and the fork of said shuttle-lever; also, that the feed-lever is mounted to oscillate in any direction and that the same is actuated directly from the crankshaft. It will be further seen that the stitchregulator is mounted directly in the arm of the machine and that the same is therefore not liable to'work loose, as is the case with the ordinarystitch-regulator nowin common use, where said stitch-regulator is carried by a moving portion of the mechanism. In order to insert the crank-shaft 5 into the upper portion of the arm, a section 36 of said arm is made removable, and after the shaft is placed in position this section is also fitted to place and held in any convenient manner. In operation the cam 2G moves the upper end of the feed-lever downward and to the right, as shown in Fig. 1, and as the lever is fulcrumed at 18 the feed is elevated. As the cam 26 moves the upper end of the feed-lever to the right, as shown in Fig. 2, and owing to the fact that the lever bears against the lug 24: and is fulcrumed at 18, said lever carries the feed-bar with it in the same direction. The feed-bar-actuating spring is attached to the feed-bar in such manner as to move the said bar downward and backward, its tension being thus communicated to the feed-lever for returning the same after the cams have ceased to act thereon. This spring further serves to balance the feed-lever and to maintain the saine against the lug 31 and also moves the depending lip 25 against the stitch-regulating spring 32. It is desirable also to provide the feed-bar with a bumper of thin felt or other suitable materialto check the forward movement of said bar and prevent noise. This insures an even length of stitch.

The mechanism above described is extremely simple and cheap in construction and requires less time to adjust and regulate and is therefore less liable to get out of order. At the same time, owing to the reduced number of parts, the machine runs much lighter and with less noise and gathers less lint and dirt,thus enabling the same to be more quickly cleaned and oiled. The contacting surfaces of the cam 26 and feed-lever 17 are pitched upon lines passing through the fulcrum 18. A narrow strip of some durable sound-dead- IOO ening material may be applied to the upright portion 23 of the feed-lever and a similar strip to the depending lip 25 in order to prevent rattling between said lever and cam 27 and spring 8 2.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is-

1. In a sewing-machine, the combination with the main shaft, and a cam thereon having two independent Working surfaces, one of which is beveled or oblique, of an oscillating elbow-shaped lever directly engaging the feedplate and having two independent working surfaces one of Which is beveled corresponding t0 the beveled portion of the cam,whereby a compound movement is imparted to said lever, substantially as described.

2. In a sewing-machine, the combinatio with an oscillating feed-lever, of a spring located within the machine-arm and arranged in the path of said lever,'and an adjustingscrew connected with the machine-arm and bearing against said spring for varying the position thereof, thereby regulating the length of stitch, substantially as described.

3. In a sewing-machine, the combination with the main shaft, of an oscillating feedlever actuated directly thereby, and a lug within the machine-arm, against which the said lever bears and upon which it fulcrums and slides substantially as described.

4. In a sewing-machine, the combination with the main shaft, of an oscillating lever fulcrumed under the bed-plate and extending up within the machine-arm and actuated directly by said shaft, and a stationary lug within the machine-arm serving as a bearing and fulcrum against which the lever rests and upon which it rocks and slides, substantially as described.

5. In a sewing-machine, the combination withthe main shaft, of an oscillating feedlever fulcruined under the bed-plate, an obliquely-disposed lug upon the inside of the sewing-machine arm, forming a rest and fulcrum for said lever, and an obliquely-disposed strip of sot't material such as felt, secured to said lever and extending substantially at a right angle to the lug, substantially as and for the purpose described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

MURNEY DENDURENT.

Witnesses:

HENRY A. MEYER, ELIAS MOSER. 

